[TIMOB-25273] Windows: TableViewRow does not fill size of TableView

Description

When using Ti.UI.FILL (or setting width to a suitable number), a TableViewRow will never fill the size of the TableView and there will be padding on either side of the TableViewRow. Code has border to attempt to highlight where the TableViewRow ends, you will notice TIMOB-24855 in this test case too I tried playing around with the [XAML ListView example](https://github.com/Microsoft/Windows-universal-samples/tree/master/Samples/XamlListView) and that seems to always go to the edge so I don't think it's a platform limitation

var _window = Ti.UI.createWindow({ backgroundColor: 'green' });
var row = Titanium.UI.createTableViewRow({
    width: Ti.UI.FILL,
    height: 150,
    backgroundColor: 'blue',
    borderWidth: 4,
    borderColor: 'pink'

});
var data = [row];
var table = Titanium.UI.createTableView({
    width: Ti.UI.FILL,
    data: data,
    borderWidth: 4,
    borderColor: 'blue',
    width: 600
});
_window.add(table);
_window.open()

Steps to reproduce

Add above code to an existing app.js and build for Windows

Actual

TableViewRow has padding on left and right, not filling TableView

Expected

TableViewRow should size to fit the TableView (to edge of the blue border)